Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e6fa05ff8a3280…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 21:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc1a128c647ae54c6e4deb1609d799b4 SHA-1: f4ec8d004f33dd2ac53f710937dcdbaa4bc8cbb3 SHA-256: 87e6fa05ff8a3280372cea006ea4b1453a0adf1c28eac93344a0589eca96f672
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are flagged as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful sites. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ruresept.ru/files/file/21801432159.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/nozisipifexofunezipeta.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/kafizetaxezagirasavigen.pdf
    • https://cahayamimpi1.com/contents/files/xitepew.pdf
    • http://polishingmarblefloor.it/userfiles/files/95006371042.pdf
    • https://tolgyesvolgy.hu/userfiles/file/pubukediruge.pdf
    • https://aawyx.com/sites/default/imageuser/file/sozebufasexobibuxazuvowif.pdf
    • http://abwrva.com/uploads/files/xenafedebapipoke.pdf
    • http://ajarnveerapong.com/UserFiles/file/mufaxebufodirafetexan.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161370d02a4821---newejagosidavivaxiw.pdf
    • http://escrima-rlp.de/userfiles/file/pabejasiwujogo.pdf
    • http://humanlitech.com/files/files/janezumiturojodotetijiri.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613438b9db64a---vuniboponanogufob.pdf
    • http://hakasasi.id/userfiles/file/15303050802.pdf
    • https://freebcard.com/ckfinder/userfiles/files/17807542652.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62858be13---80842742520.pdf
    • http://deeringbayrealestate.com/userfiles/files/5724023102.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/76051242674.pdf
    • https://agmatbaa.com/upload/files/29040610096.pdf
    • http://rentbucharest.net/images/userfiles/90111314343.pdf
    • http://szzxwx.com/Upload/Upload/file/2021923723401298.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=inspirational+basketball+players
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 16792 bytes
font_01_sfnt_off0000e843.bin
d4e2b408ab3ac30611acc2640c59075f34edacb446a226fed398a1cecc45487f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 17448 bytes
font_02_sfnt_off000115b2.bin
116bf217391d5437f36190ca72b89b7cd42c0ed5bfe0f8e647a62bbb570fd0ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 10544 bytes

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